Metal-working.



N. E. CLARK.

METAL WORKING.

APPLICATION FILED NOV. 29, 1912.

Patented July 21, 19M

6 SHEETSSHEBT 1.

' HW/E/VTOR WITNESSES N. E. CLARK.

METAL WORKING. 7 APPLICATION FILED NOV. 29, 11112.

1,1(Q4b477 Patented July 21, 1914.

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to N w 0 N. E. CLARK.

METAL WORKING.

APPLICATION FILED NOV. 29, 1912.

Patented July 21, 19M.

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HW/EIVTOR Norris Elmore Clark,

WITNESSES N. E. CLARK.

METAL WORKING.

APPLICATION FILED NOV. 29, 1912. I LlQQlfigTK I Patented July 21,1914.

6 SHEETSSHEET 4.

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mmsssEsum/wok N. E. CLARK.

METAL WORKING.

APPLICATION FILED NOV. 29, 1912.

LILQQ Q'TK Patented July 21, 1914.

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. 101 WITNESSES I l/WEfl/TOR N.E.CLARK.

METAL WORKING.

APPLICATION FILED Nov.29,191m

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. 107 WITNESSES I INVENTUR move the corrugations and bring the reticu- 'of metal uniformly and economically and by For convenience I will refer to such preof the scored sections and forming the openno STATES NORRIS ELMORE CLARK, 0F

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METAIBWURKING.

Specification of Letters Patent.

Patented July 21, 1914.

Application filed November 29, 1912. Serial No. 734,1(14.

T 0 all whom it may concern:

Be it known that LNoRnrs ELMORE CLARK, a citizen of the United States of America, and residing at Plainville, in the county of Hartford and. State of Connecticut, have invented new and useful Improvements in Metal-lVorking, of which the following is a j specification.

My invention relates particularly to a machine for automatically forming reticulated-metal sheets.

The main object is to provide a mechanism for expanding slitted or scored sheets means of which longitudinal corrugations of greater or less de th, as desired, may be formed. Sheets of metal are slitted, punched or scored so as to provide a plurality of longitudinal continuous strips connected by expansible sections. This treatment is preferably a simple slitting operation severing the metal in a suitable arrangement but it may be by apunching operation which removes more or less of the stock, or it may be by a scoring operation which removes a part of the thickness of the metal, indenting the metal or weakening it along suitable lines so that the metal may be readily fractured by the subsequent stretching action.

liminary treatment as scoring, but it will be understood that this case relates solely to the mechanism for handling the scored stock and forming the reticulated product.

The mechanism includes a series of punch bars and coacting die bars constructed and arranged soas to subject the scored stock to a corrugating action, bending the strands work or reticulated sections, and then to spread out or flatten the sheet so as to related sections all into a common plate. In addition to this action, some or all of the longitudinal strips or unscored portions may be subjected to a corrugating action so as to form stiffening ribs. The shape and size of these ribs will depend upon the articular punches and dies used and their a justment. At the end of the forming action the ends of the sheet may be trimmed automatically. When treating stock slitted according to my Patent #979,130 I prefer to move the corrugating punch bars longitudinally so as to proper direction. This is ac omplished automatically in the .mechanism h rein shown. It should be understood however, that the machine may be employed in treating stock which has been slitted or scored in any suit able arrangement.

Important details of im rovements will be more fully hereinafter escribed and set forth in the claims. 7

"Figure 1, is a front. elevation of a machine embodying the improvements of my invention. Fig. 2 is a vertical rojection of the drive end of the machine. ig. 3, is a fragmentary' detail sectional viewshowing the :method of adjusting the stroke. Fig. 4, is a detail view of an adjustable indicating worm gear. Fig. 5, is a vertical sectional :view on the plane of the line X X of Fig. 1 showing the punch and die bars in position ready to receive the scored stock. Fig. 6,

:is a fragmentary vertical sectional view on a sition ready to corrugate and illustrating the die locking mechanism. Fig. 7, is a fragmentary vertical sectional view on the plane.

jofthe line Y of Fig. 1 showing the punch and die bars in position at the end of the cora-ugating action and showing the toggle connections. Fig. 8, is a front view showing the mechanism for releasing the dies and per nitting them to close after the completion of the operation. Fig. 9, is a fragmentary detail view showing art of the mechanism for closing the pune es. Fig. 10, is a vertical sectional view of the same on the plane of the line Z Z of Fig. 9 and showing the mechanism for moving the alternate punch bars longitudinally. Fig. 11, is a detail view showing the part of the mechanism shown in Fig. 10 for causing the return longitudinal movements of the alternate punch bars.

Figs. 12 to 16 inclusive are diagrammatic movement of the alternate vertical punch bars so as to hend the strands and open the meshes. Fig. 15 shows the punch and die bars all moved laterally to spread the sheet facilitate the bending of the strands in the and set the sheet and the end cutters operated to trim the ends, of the sheet. Fig. 16

shows the punch mechanism raised and the punch bars in their upper retracted posi-' tion and the finished stock ready to be removed from the die bars. Fig. 17, is a detail fragmentary view of one form of metal lath formed on my improved machine by the method herein set forth. Figs. 18, 19 and are diagrammatic views showing modifications of the punch and die bars for forming a fabric having higher ribs. Fig. 21, is a detail view showing one form of such fabric.

The main lower side frames 1, 1 are supported by the end legs 2, 2 and the center leg 3 and the ends of the side frames are connected by cross members 4, 4. A series of bottom plates such as 5 are supported on the inner flanges of the side frames 1, 1. A series of transverse guide shafts such as 6 and 7 connect the side frames 1, 1 and serve to guide the die members 8, 8 which rest upon the bottom plates 5. The shafts 6, 6 are stationary and the shafts 7, 7 have a limited rotative movement for releasing the dies as will be hereinafter understood.

A series of parallel guide shafts such as 9 have their ends supported in bearing plates 10 which are guided in ways 11 in the inner face of the frames '1, 1, and are vertically movable together with the die bars 12 and 13. Bushings such as 14 are provided for the die bars 12 and 13 to guide them in their lateral movement on the shaft 9. The die bars 8, 8 are also provided with bushings similar to 14 to support them on the shafts" 6 and 7. It will be noted that the bushings are practically twice the width of the thickness of the die bars. This affords broad and durable bearing surfaces and assists in maintaining the die bars in their proper vertical positions during their movements. The adjacent die bars are connected to each other by links such as 15, 15 (see Fig. 7) which constitute toggle connections and insure the relative separation of the die bars when the die bars 12 and 13 are forced downwardly, and the upward movement of the die bars 12 and 13 when they are pressed together. Although the die bars are guided on thetransverse shafts 6, 7 and 9 and will therefore be maintained parallel to each.

other as they move laterally, I prefer to provide two sets of these toggle links as shown in the diagram of Fig. 12 at 15 and 15 so as to insure parallel action without binding on the guide shafts. The die bars are pressed toward each other by the die closing levers 16, 16 which are pivoted at 17 and provided with counterweights 18. I also prefer to provide locking devices as shown in Figs. 6 and 8. Some of the shafts 9 are provided with cams such as 19 with recesses 20 at their inner ends to receive spring pressed locking pins 21. The pin 21 is carried by a yoke 22 which is vertically movable in theouter die bar 13. In the position shown in Fig. 6 the locln'ng pin 21 is arranged in the recess 20 in the shaft 9 and the die bars are all looked together in 7 the releasing member 24 as will be herein-- after understood. The pin 21 is..released from the recess 23 by pressing the yoke 22 downward by hand operated mechanism as shown in Fig. 8. The angle bar 25 is supported by arms 26 which are pivoted on shaft 7. Springs 27 press the bar 25 upward. The yoke 22 has a projection 28 which is adapted to come beneath the finger 29 of the arm 26 when the dies are in their opened out position and the pin 21 is in the notch 23. Pressure on the bar 25 rocks the arms 26 and causes the fingers 29 to press down on the projections 28 and move the yokes 22 and pins 21 downward so as to release the die bars and permit the. counterweights and levers 16 to draw themtogether. The center die bar has one or more downwardly projecting pins 30 guided in the bottom plates 5 as shown in Fig. 5 so that the center diebar can simply move up and down while the toggle and parallel connections permit the die bars 8 -to move outwardly and the die bars 12 and 13 (ex= cept the center die bar 12) to move downward and outward. I

At the corners of the achine are. four upright posts or columns 5 held to the end leg frames by nuts 36. These columns support the upper side frames 37 and the latter are connected at the ends by the upper end frames 38. On the four columns 35 is guided a vertically movable gate, head or platen. This consists of side'frames 40, 40 connected by end frames 41, 41. Theside frames 40, 40 are also connected by a top plate or plates 42 similar to the bottom plates 5. The gate carries all the punch bars which are arranged in two series similar to the die I bars. The upper punch bars such as 43 and 44 are all guided by shafts 45 which are fixed in the side frames 40, 40 of the gate. The lower punch bars such as 46 alternate with the punch bars 43 and 44 and are carried by a series of shafts such as 47 which macaw (see Figs. 7 and 12). As before mentioned, in regard to the die bars, these links are preferably arranged in two sets 51, 51' (see Fig. 12) so as to insure parallel action. The

upper outer side punch bars 43,. 43 are pro-J V1 ed with ilot pins 52 which are ada ted to fit in ho es in the upper outer die ars 13, 13 so that the outer punch and die bars are compelled to move laterally with each other when the pilot pins are entered. The punch and die bars are provided with suitable working faces such as 53, 54and 55, 56 and 57, 58 shaped according to the shape that it is desired to give the longitudinal members of the product, for instance, corrugated or fiat. It is particularly desirable to shape the working faces 57 and 58 so as to corrugate the edges of the sheet longitudinally and g-ip it more securely. The

' As the punch bar member 57 is carried by a number of pins 59 which are guided in the upper outer punch bars 43, 43 and pressed downward for instance by springs such as 60 so that'when the members 57 engage the members 58 or the sheet is operated on as shown in Fig. 13, theremainder of the punch mechanism may continue downwardly independently.

In some cases it is desirable to have the lower punch members or their bearing pieces 55 move longitudinally durin' the corrugating action. This is accomplished by mechamsm such as shown in Figs. 9, 10 and 11. The bearing piece 55 fits in a groove 62 in the punch bar 46 and is longitudinally movable being supported by a pin 63 in the slot 64.

One or more of the shafts 47 has an arm 65 which fits in a notch 66 in the bearing ieces 55. One end of the notch 66 is for-me by a separate plate 67 for the purpose of replacement and taking up wear. The outer ends of the shaft 47 carry cams 68 which embrace the flattened sides of rods 69 which are carried by the stationary brackets 70. The shoulders 69 serve as the up er abutments for the cams 68 and the nut 1 serves as a lower abutment. The ends of the punch bars 46 abut against the lower edge of the plate 72 when the ate is raised.- This plate 72 is clamped by bo ts 7 3 to the cross bracket and may be adjusted up or down and held by the set screws 74 so as to vary the upward and downward position of the abutment for the punch bars 46. When the gate is moved downward (as will be hereinafter understood), the lower punch members engage the stock as shown in Fig. 13 and at the same time the cams 68 engage the nuts '71. ate continues to move downward and carries the punch members into the position shown in Fig. 14, the cams 68 pressing on the nut 71 cause the shaft 47 to be rotated anti-clockwise as viewed in Fig. 10 and the arm 65 engaging the bearing piece 67 in the slot 66 moves the bearing piece 55 of the punch member 46 longitudinally in the direction of the arrow in Fig. 10. This facilitates uniform action of corrugating the slitted or scored stock but in some cases it may be found unnecessary. When the head is retracted, the cam 68 engages the shoulders 69' on the upward movement and is thus rotated backward and the shaft 47 and arm 65 rotate so as to throw the bearing member 55 toward the left as viewed in Fig. 10.

The pulley 7 5.- and its shaft 76 are appropriately geared to the spur gear wheel 77 on the shaft 78. Onopposite ends of the shaft 78 are cranks 79, 79 connected by rods 80 to the wrist pins 81 having bearings in the end frames of the seen that when the shaft 78 rotates, the gate is vertically reciprocated. The vertical movement of the g te may be started and stopped as desired for instance, by means of a clutch 82 interposed between the gear wheel 77 and the shaft 78 and operated for' instance by means of a treadle 83. To counter balance the weight of the gate and the punch members, I have provided a system of counter-weights as shown in Figs. 1 and 2. The weight 84 is carried by the long arm of the lever 85 pivoted at 86. The short arm of the lever is connected by a link 87 to the pin 88 carried by the gate. To provide adjustment for the stroke of the punch mechanism T have designed the mechanism shown in Figs. 2, 3 and 4. The wrist pin 81 has secured to it a Worm gear 89 and in'me'sh with this worm gear is a worm 90 ate. It will thus be carried by the hand wheel 91 for the purof the worm gear will raise or lower the position of the wrist pin and thus vary the position of the gate and the action of the mechanism. For the purpose of clamping the adjusting worm 90 and the worm. gear 89 have split the head of the connecting rod 80 as at 92 and rovided a take-up or clamp-bolt 93 (see Fig. 3). In orderthat both ends of the gate may be adjusted properl to the same extent, I have provided an in icating device. This consists of a scale 94 on the worm gear 89 and a sight opening 95 in the end yoke of the gate (see Figs. 2 and 4), en the hand wheel 91 and the worm gear 89 are rotated, the scale reading is taken through the sight opening and the same adjustment may be effected on the opposite end of the machine.

Cutter mechanism is provided at opposite ends of the machine for cutting off or trimming the ends of the sheet after the corrugating and spreading action. This consists of cutters 97 and 98 at opposite ends, the upper cutter being movable with the gate and brought into co-action with the mesh work.

scope of my invention and that the terms employed in the claims are terms of description rather than of limitation except so far as required by the state of the art.

What I claim is 1. In a metal working machine, two series of vertically and laterally movable punch bars, cooperating die bars and means for bringing one'series of the punch bars into operation in advance of the other series upon slitte'd stock to corrugate the same and form corrugated mesh work and means for separ ting the bars laterally for spreading out the corrugated portions of the reticulated sheet and setting it without closing (the 2. In a metabzvorking machine, a series-of vertically and laterally movable punch bars,- cooperating die bars and means for bringing the punch bars into operation upon slit-ted stock to corrugate the same and form mesh Work, means for separating the bars laterally for spreading out the reticulated sheet and means for automatically looking one set of bars in their laterally separatedpositipn.

3. In a metal working machine, a series of vertically and laterally movable punch bars, cooperating die bars and means for bringing the punch bars into operation upon stock to corrugate the same and form mesh work, means for separating the bars laterally for spreading out the reticulated sheet and means for moving alternate bars of one set of bars longitudinally.

5. In a metal working machine, a series of punch bars and a seriesof die bars corresponding thereto, parallel motion links connecting the punch bars, parallel motion links.

connecting the die bars and means forbring- 111g one set of-bars into operation lIFGOIljunctionwithslitted stock to corrugate and v spread the same.

6. In a metal working machine, a set of die bars arranged in -two series, horizontal guide shafts, one set of die bars being laterally, movable thereon and vertically movable horizontal guide shafts carrying the. other set of die bars, connecting links between the die bars and punch bars ytor cooperating with said die bars for cor-rugating and spreading the sheet substantially as described. i I

7. In a metal working machine, asstof die bars arranged in. two series, horizontal v guideshafts, one set of die bars being laterally movable thereon and vertically movable horizontal guide shafts carrying the other set of die bars, connecting'links between the die bars, punch bars for cooperating with said die bars for corrugating and spreading the sheet substantially as de scribed and means for locking. the die bars in their laterally separated position.

8.' In a metal working machine, a set of die bars arranged in two series, horizontal uide shafts, one set ofdie bars beinglater ally movable thereon and vertically movable horizontal guide shafts carrying the other set of die bars, connecting links between the die bars, punch barsfor cooperatingwmh said die bars for corrugating and spreading the sheet substantially as described, means for locking the die bars in their laterally separated position and; means for manually releasing the same.

9; In a metal working machine, a set'of die bars arranged in two series, horizontal guide shafts, one set of -die bars being laterally movable thereon and vertically movable horizontal guide shafts carrying the other set of die bars, connecting links etween the die bars, punch bars for coiiperating with said die bars for corrugating and spreading the sheet substantially as described, means for locking the the bars in their laterally separated positionand means for pressing said die bars together.

10. In a metal working machine, a set of die bars arranged intwo series, horizontal' guide shafts, one set of die bars belng laterally movable thereon and vertically movable horizontal guide shafts carrying the other set of die bars, connecting'links between the die bars, punch bars for cooperating with said die bars for corrugating and spreading the sheet substantially as de scribed and means for locking the die bars together.

11; In a. metal working machine, a set of die bars arranged in two series, horizontal guide shafts, one set of die bars belng laterally movable thereon. and vertically movable horizontal guide shafts oarrying the other set of die bars, 1connect1ng links crating with said die bars for oorrugating and spreading the sheet substantially as -described, means for lockingfthe die bars togetber and means operatin with the punch bars for releasing said loo ing mechanism.

12. In a metal; workingmachine, two sets of punch bars, two setslof die bars, said.

between the die bEIS,.pHI1Ch bars for coop- 4 punch bars being vertically movable and all of said punch bars except one punch bar being laterally movable, some of said punch bars having a greater vertical movement than the others and means for interlocking the punch bars with the die bars for causing them to separate laterally at the same time.

of punch bars, two sets of die bars, said punch barsbeingvertically movable and all of said punch' bars except one punch bar being laterally movable, some of said punch bars having a greater vertical movement than the others and means connecting the punch bars for causing them, to move i "laterally and be maintained parallel while moving vertically.

15'. In a metal working machine, two series of die bars, the central die bar and die bars alternating therewith being verti:

cally movable, the die bar on each side of. the central bar being laterally movable and punch bars cooperating with said die bars;

the central punch bar being vertically mov-' able and the other punch bars being laterally and vertically movable.

16. In a metal working machine, two sets of die bars, the central die bar and die bars alternating therewith. being vertically movable, the die bar on each s1de of the ce tral bar being laterally mcwable and punch bars cooperating with said die bars, the central punch bar being vertically movable and the other punch bars being laterally and vertically movable and means for interlocking said punch "and die bars.

- 17. In a metal working machine, two sets of die bars, the central die bar and die bars alternating therewith being vertically movable, the die bars on each side of the central bar being laterally movable and punch bars cooperating with said die bars, the central punch-bar being vertically movable and the other punch bars being laterally and vertically movable, means for interlocking said punch and die bars and means for releasing the interlocking means.-

18 In a metal working machine, two sets of die bars, the central die bar and die bars alternatlng therewith being vertically movable, the die bar on each side of the central bar being laterally movableandpunch bars cooperating with said die bars, the central punch bar being vertically movable and the other punch bars being laterally and vertically movable, means for interlocking said punch and die bars and means for causing the punch bars and die bars to move vertically and laterally together and maintaining the punch bars in parallel planes.

19. In a metal working machine, two Series of bars, oneseries being vertically movable and both series being laterally movable, guide shafts for both series of bars 14. In a metal working machine, two sets and parallel m'otion links connecting said i 22, In a metal working machine, two se- I ries of bars, one series being vertically movable and both series b eing laterally movable, guide shafts for both series of bars, parallel motion links connecting said series of bars and means for locking said bars in position when laterally separated.

23. In a metal working machine, two series of bars,- one series being vertically movable and both series being laterally movable,

guide shafts for both series of bars, parallel motion links connecting said series of bars, means for locking said bars in position when laterally separated and means for manually releasing said locking means. 24. In a metal working machine, two series ofbars, means for moving one'of said I series of bars vertically, means for separating all of said bars laterally and means for longitudinally moving one of said series of bars.

25. In a metal Working machine, two series of punch bars, a series of die bars'cooperating with one series of-said punch bars to hold unslitted portions of slitted stock, means for bringing the other series of punch bars into operation to form deep corrugations along the center lines of the slitted portions and form the open mesh and means for laterally separating the punch bars for spreading the stock and bringing the corrugated'portions into a common plane.

26. In a metal working machine, two series of punch bars, two sets of die bars, means for moving said punch bars so as to corrugate the' slitted portions of the stock,

means for separating said bars for spreading the stock and means at the same time for corrugating the unslitted portions of the stock.

27 In a metal Working machine, two series of punch bars, two series of die bars and means for moving said punch bars verticall'y to corrugate the slitted stock and to form shallow corrugations in un-slitted portions of the stock and means for separating said bars for spreading said stock.

28. In a metal working machine, two series of punch bars, two series of die bars,

means for moving someof said punch bars; for corrugating slitted portions of the stock; means for moving other punch bars for cor- Q rugating unslitted portions of the stock and, means for separating said bars for spreadi 3 links. between the adjacent bars and a stop ing the corrugated slitted portions.

29. In a metal working machine, vertical; movable punch bars and die bars for coacting therewith, means for interlocking thef punch bars and die bars, means for locking the die bars together in the first part of the Y operation of the machine means for-releas- I ing said locking mechanism, and means for spreading said punch bars and die bars apart laterally when said locking means is;

' engaged by one series of punch bars for released.

30. In a metal worln'ng machine, vertical movablepunch bars and die bars for coacting therewith, means for interlocking the punch bars and die bars, means for locking the die bars together in the first .part of the operation of the machine, means for releasing said locking mechanism,i means for spreading said punch bars and die bars apart laterally when said locking means is released andmeans for locking the die bars in their laterally separated position.

31. In a metal working machine, vertical movable punch bars and die bars for coacting therewith, means for interlocking the punch bars and die bars, nieans for locking.

the die bars togetherin the first part of the operation of the machine, means for releasing said locking mechanism, means for spreading said punch bars and die bars apart laterally when said locking means is released, means .for locking the die bars in theirlaterally separated position and means for retracting the punch bars.

32. In a metal working machine, a series of punch bars, a series ofdie bars and means for vertically reciprocating the punch bars including adjustable connecting rods at opposite ends of the punch bars, adjustable eccentrics with indicating dials and hand operable means for rotating said eccentrics.

33. In a metal working machine, twoseries of die bars, a bed supporting one series of die,bars, vertically movable shafts supporting the other series of die bars, two series of vertically movable punch barsfor coacting with said die bars and means for forcing some of said punch bars and die bars apart laterally.

34. In a metal working machine, two series of die bars, one series being laterally movable, the otherv series being vertically movable; some of said second series being laterally movable, a vertically movable gate including a top bar, punch bars carried by said vtopbar and some'of said series being laterally movable and the other series of punch bars being laterally movable and also pressed.

vertically movable relative to the first men tioned seriesof punch bars.

35. In metal working machine, two series of vertically movable punch bars, die bars coacting therewith, connecting limiting their upward movement and causing said unchibars to close together as the other series of punch bars moves vertically and means for adjusting said stop: plate.

37."In' a metal .working machlne, two

series of die bars one series being laterally movable and some of the die bars of the other series being vertically and laterally movable and means pressing upwardly and toward the center on the outer die bars for forcing them together and means of connection between said die bars for, causing them to move in parallel planes and punch bars cooperating therewith.

38. In a machine for expanding sheet metal the combination of pedestals, a lower frame carried thereby, a plurality of transversely' movable :die bars extending longitudinally-of said frame, means tending to press said die bars toward each other, corner posts supported by said pedestals, an'

said gate vertically and meansfor causing I the respective punch bars and die bars to separate laterally when said gate is de- 39. In metal, a lower frame, guide shafts extending transversely thereof, bushings mounted.

on said. shafts, die bars mounted on said bushings, means-for holding said die bars spaced apart froin'each other, punch bars for cooperating with, stock supported on said die bars and means for moving the punch 'bars and die bars laterally to spread the stock.

40. In a machine for expanding sheet a machine for expanding sheet metal, a plurality of n rse guide shafts; bushings supported on said shaft d b mounted onsaid bushings, other die bars mounted between said first mentloned die bars, a support for said other die bars and punch bars for cooperating with all of said die bars and means for operating said punch and die bars for spreading stock.

41. In a machine for expanding sheet metal, bottom plates, a. series of die bars" supported thereon, a second series of die bars, supporting shafts for said second series of die bars with means for connectingthe bars of the two series to cause them to have proportionate lateral movements and unch bars cooperating with all of said die bars.

- said second series of punch bars, means for connecting the punch bars of the two series for causing them to have proportionate limited movements and die bars cooperating with said punch "bars.

43. In a metal working machine, a series of vertically and laterally movable punch bars, cooperating die bars and means for bringing the punch bars into operation upon slitted stock to corrugate the same and form mesh work and means for separating the bars laterallyfor spreading out the reticulated sheet and cutters for trimming the ends of the sheet. I

it In a metal working machine, a series of vertically and laterally movable punch bars, cooperating die bars and means for bringing the punch barsinto operation upon slitted stock to corrugate the same and form mesh work, means for separating the bars laterally for spreading out the reticulated sheet and means for moving alternate bars of one set of bars longitudinally and cutters for trimming. the ends of the sheet.

45. In a metal working machine, two sets of punch bars, two sets of die bars, said punch bars being vertically movable and all of said punch bars except the central punch bar being laterally movable, some of said punch bars having a greater vertical movement than the others and cutters for trimming the ends of the sheet.

46. In ametal working machine, two series of die bars, the central die bar and'die bars alternating therewith being vertically mov able, the die bar on each side of the central bar being laterally movable and .punch bars cooperating with said die bars, the central punch bar being vertically movable and the other punch bars being laterally and vertically movable and cutters for trimming the ends of the sheet.

4C7. In a metalworking machine, two series of bars, one series being vertically movable and both series being laterally movable, guide shafts for both series of bars and parallel motion links connecting said series of 42. Ina machine for expanding sheet bars and cutters for trimming the ends of the sheet.

of punch bars, two sets of die bars, means for moving said punch bars so as to corrugate the slitted portions of the stock and 4:8. In a metal working machine, two series means for separating saidbars for s reading the reticulated stock and cutters "or trimming the ends of the sheet.

4-9. In a metal working machine, two series of punch bars, two sets of die bars, means for moving said punch bars so as to corrugate the slitted portions of the stock, means for separating said bars for spreading the stock .means for moving said punch bars vertically to corrugate the slitted stock and to form shallow corrugations in unslitted portions of the stock and means for separating said bars for spreading said stock and cutters for trimming the ends of the sheet.

51. In a metal working machine, two series of punch bars, two series of die bars, means for moving some of said punch bars for corrugating slitted portions of the stock, means for moving other punch bars for corrugating unslitted portions of the stock and means for separating said bars for spreading the corrugated slitted portions and cutters for trimming the ends of the sheet.

52. In a"metal Working machine, vertical movable punch bars'and die bars for coacting therewith, means for interlocking the n punch bars and die bars, means for locking the die bars together in the first part of the operation of the machine, means for releasing said locking mechanism and means for spreading said punch bars and die bars apartlaterally when said locking means is released and cutters for trimming the ends of the sheet. I

53. In a metal working machine, a main frame, two series of die bars carried thereby and vertically and laterally separable, a cutter carried by said frame across the end of said die bars, a reciprocating gate, two series of punch bars carried by said gate and ver-.

gripping the edges of a slitted sheet, vertically movable barsfor holding unslitted in-- termediate portions of the sheet, bars for corrugat-ing and Opening the slitted portions of the sheet, means for separating all of said bars so as to spread out the corrugated slitted portions and cutters for trimming the ends of the sheet,

56. In a metal working machine, means for expanding a slitted sheet and cutters for transversely trimming the ends of the expanded sheet and means for automatically and sequentially operating the expanding. means and the cutters.

57. In a met-a1 working machine, punch and die bars adapted to hold between them a corrugated expanded metal fabric, means for spreading said bars laterally to bring the expanded portions into a common plane and means engaging the expanded portions for holding them while the fabric is being spread out;

58. In a machine for expanding sheet metal, a set of die bars normally spaced apart from each other and adapted to support the ribs of a corrugated meshwork, a set of punch bars adapted to engage the ribs of meshwork supported on said die bars, means for moving said punch bars vertically, means for moving said punch bars and said die bars laterally to spread the corrugated meshwork and means arranged between the bars of one set of said sets of bars for coiiperating with the corrugated meshwork during the spreading action and asslsting it to its proper spread position.

59. In a machine for expanding sheet metal, a set of die bars normally spaced apart from each other and adapted to support the ribs of a corrugated meshwork, a plural ty of punch bars adapted to engage the ribs of said meshwork on said die bars, other punch bars for engaging the mesh-v work between said die bars and means for separatingsaid punch bars and said die bars laterally for spreadin the stock.

60. In a machine or expanding sheet metal, a. plurality of die bars, pivoted, counter-weighted die closing levers, punch bars for cooperating with said die bars, means for operating said punch and die bars to spread" the stock, means for locking the die bars in their spread position and means for releasing said lockingmeans and permittingsaid levers to close said die bars.

61. In a machine for expanding sheet metal, a set of die bars for supporting the ribs of a sheet, a set of punch bars for engaging ribs supported on said die bars, means for moving said punch bars downwardly, means connecting said die bars for causing them to move downwardly and to separate laterally when pressure is applied to them by said punch bars, whereby the stock is automatically s read'by the operation of the pressure of t e punch bars; 62. In a machine for expanding sheet metal, a set of diebars for supporting the ribs of the stock, a set of punch bars for engaging the ribs supported on said die bars, other punch bars between the bars of said set of punch bars, abutments for said other punch bars, means of connection between all of said punch bars, whereby when said punch bars are depressed certain of said punch bars engage said abutments, and automatically spread said punch bars laterally when pressure is applied upon them. 63. In a machine for expanding sheet metal, a plurality of die bars for supporting the ribs of the stock, a plurality of punch bars for coiiperatingwith the ribs supported on said die bars, means for separating the punch bars and the die bars laterally to spread the stock, means for automatically locking the die bars in their spread posltlon while the punch bars are being retracted, means for releasing said die bars and means for closing said die bars when released.-

64. In a machine for expanding sheet metal, a set of die bars, means for locking them in their closed position, a vertically movable gate, punch bars carried thereby for cotiperating with said die bars, means for depressing -said gate and punch bars and means carried by said gate for releasing said locking means when said gate is depressed.

NORRIS ELMORE CLARK. Witnesses:

D. G. CLARK, R. C. Usma. 

